Herschel's 20-foot telescope. Illustration of the 20-foot (6 metre) reflecting telescope built by astronomer William Herschel (1738-1822). Herschel built his own telescopes,laboriously grinding the lenses himself to near perfection. This was his most successful instrument; with it he discovered two new satellites of Uranus - Titania and Oberon | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 3504 px × 2404 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |